SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8038bc2396171e56df60b44841706efdb7c401ab71682bd696b273915dd6131a' 
  AND token = 'lW0hnkwrqm5nIA1xjLtpet7mA56ZC9VDBzygOVoxSFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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