Terraform import aws key pair.MyNewKeyInTerraform YourExistingKeyName2

 terraform import aws_key_pair.MyNewKeyInTerraform test
aws_key_pair.MyNewKeyInTerraform: Importing from ID "test"...
aws_key_pair.MyNewKeyInTerraform: Import prepared!
  Prepared aws_key_pair for import
aws_key_pair.MyNewKeyInTerraform: Refreshing state... [id=test]
╷
│ Error: Cannot import non-existent remote object
│
│ While attempting to import an existing object to
│ "aws_key_pair.MyNewKeyInTerraform", the provider detected that no object
│ exists with the given id. Only pre-existing objects can be imported; check
│ that the id is correct and that it is associated with the provider's
│ configured region or endpoint, or use "terraform apply" to create a new
│ remote object for this resource.
╵

See also

• terraform import, terraform import --help