SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '634db57be32cf6d0fa42f48d1b695e0b8bf66ba451ae035a5915271c96ce8f5d' 
  AND token = 'Y+VGHJMnniETPaHQcY3YdNYjqYj5mMT2qvQsIWsMLqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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