Does my iPad AppleCare work for accessories bought after my initial purchase?

Hello. I am the owner of an M1 iPad Air that I bought in November of last year brand new. I purchased 2 years of AppleCare+ to protect my purchase. I recently bought a used Magic Keyboard on eBay. Will the previously used keyboard be included in my AppleCare coverage if I accidentally damage it? The AppleCare + coverage is supposed to also cover accessories, and I haven’t seen any specification between new and used. Thanks!

[Re-Titled by Moderator]