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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd97eb70bb120724a33dda1f9b4c89c9db77fa3d7d137fd05d8eb01cb264d0b69' 
  AND token = 'XRCtvtr0zef3KuZadHb6rAPHevIU+LIEkMkMaIK1L4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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