Apex domains cannot have CNAME records.
Question and response
Question
dig key-p.com. NS
Answer
key-p.com. 4 NS ns02.key-p.co.jp.
key-p.com. 4 NS ns01.key-p.co.jp.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0