SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '740c23f1552f96f3f3324ec0fd60e847214145a23b347411bee37e664ae85db0' 
  AND token = 'vXaItuRJ4B/mF4wMCtJFN/EvXvjbBBZE5QCwUkLsB1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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