SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de71f5682b185789e8609735b6d5467d2d893b53168bcc6cc53913859301f55b' 
  AND token = 'BjZx9cpMUw2zqQrCBIFhNFIa+1j1XDaVndDR6WTP3yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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