SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2592199ac140da5a088da4b58db13091599542a01a1698a8f03865fbebbe8697' 
  AND token = 'W0jgU8KOqdZwBpwYJU4KORnrSzUThVhHqnP02OYGf5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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