SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '126a39bb3f465ce3ea4856ed8c1c6fdeeac8105b24a938d10715b509a3616566' 
  AND token = 'Xs4mbBK6CvIo/vywGQMTzPvHNjXRvRI6JWH3hTbIKlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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