SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1efe4a77d4f5b731a568c139710f42d98a4bb62e5f06282af08963977d9784ca' 
  AND token = 'xkzKowUwjZ5M+Vh/7vsae6nkKffvUH8oqDXoPyWY05k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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