SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8296d0d2455e8e3ef84f283c993bede039856954ceb7b6fac265aee2f5a7200' 
  AND token = 'uBr10ISG/6/80O8CHZRCnawnQtuU/gLXJb6YzVhP4v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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