SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9de90516e6dd5b761cc0de259ef6fdf8107bfa52132c52a54b2a426f80b2b363' 
  AND token = '2fY8ZfEjiUWocefh/iVVNWRULJYdKzi3UGCQLvA+I48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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