This hadith is fabricated and false as stated in the fatwa islamqa #192341
This hadith is false and fabricated. This report was narrated by ad-Daylami in Musnad al-Firdaws, and a similar report was narrated in Kanz al-‘Ummaal (9/465), via Muqaatil ibn Sulaymaan: Fadl ibn ‘Ubayd told us, from Sufyaan ath-Thawri, from ‘Ubaydullah al-‘Umari, from Naafi‘, from Ibn ‘Umar, and attributed to the Prophet (blessings and peace of Allah be upon him): “Whoever recites Aayat al-Kursiy after doing wudoo’, Allah will give him the reward of forty scholars, and raise him forty degrees in status, and give him in marriage forty of al-hoor al-‘iyn.” This is a fabricated isnaad. Muqaatil ibn Sulaymaan was a well-known liar. An-Nasaa’i said: The liars who were well known for fabricating hadith were: Ibn Abi Yahya in Madinah, al-Waaqidi in Baghdad, Muqaatil ibn Sulaymaan in Khurasaan, and Muhammad ibn Sa‘eed in Syria.
End quote from Mizaan al-I‘tidaal (3.562) (Qute from the fatwa above)
Elsewhere I found a statement of imam a-Shawkani commenting the narration: it includes Muqaatil ibn Sulaymaan who is a liar (Source in Arabic islamweb #76015)
The strongest ahadith on the virtues of recitation of ayat al-Kursi are those recommending its recitation after each ordered prayer:
it was narrated that Abu Umaamah said: “The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Whoever recites Aayat al-Kursiy immediately after each prescribed prayer, there will be nothing standing between him and his entering Paradise except death.” This is how it was narrated by al-Nasaa’i in al-Yawm wa’l-Laylah, from al-Hasan ibn Bishr. It was also narrated by Ibn Hibbaan in his Saheeh from Muhammad ibn Humayr, who is al-Homsi, and is also one of the men of al-Bukhaari. The isnaad meets the conditions of al-Bukhaari. (See for example in fatwa islamqa #6092)
Furthermore you may find other recommendations for reciting it in Tafsir ibn Kathir see for example on qtafsir.