SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4499109d46a80d47693f616dbfb71fb6924217570907808eb0a310f744fbf33f' 
  AND token = 'NUBZYUiOthOASqtoLVDwloGvW1zyrFxwkv5YyliqbMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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