SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '094bb4b0ca8e530c81d801767333560ff5e01e2126934120bfd120ea2eca5941' 
  AND token = 'FZ1+MQUTDNgRJ2My3GEdW/C+Fwuj2WjJQHLJtoA77vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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