SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a144c1420ee2d6b23f895f7bfd1b7d9d1853e269b697d8f932038b7a80a1ccd7' 
  AND token = 'tBZppxFDvXSExszJTGMpBPXRejlq+eAYSGifqea3Qck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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