Apex domains cannot have CNAME records.
Question and response
Question
dig krivanto.com. NS
Answer
krivanto.com. 5 NS ns1.krivanto.com.
krivanto.com. 5 NS ns2.krivanto.com.
Authority
The response has no authority records.
Additional
ns1.krivanto.com. 5 A 51.79.226.239
ns2.krivanto.com. 5 A 199.34.16.156
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0