SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '447d7f22981af5f2da127bb15c290b7a89cdd8fa094a5e50acbe238668c28758' 
  AND token = 'nfutIUjHaOYGSe6+Ims+2S4MeZC35Gk+mJnnmv6VfFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}