SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd167c0008d6331c3ca1eb0ba44bf00b52bda12d85b494862f86db1d38ba6ecf4' 
  AND token = 'pfOvYqQPTySwiXLcUzvWXlUP4chNUbZLq5YamWwzwjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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