Webform token in emails: need example
Under Webforms > E-mails > E-mail template choose Custom Template.

Remove the [submission:values] token. That's what lists all the fields and their values with labels. Customize the other text as you wish.

Note the "Browse available tokens." link below the text box. This pops up a window that shows you what placeholders you can put in to build your email. You can even click on the browse tokens popup to add them to the text field. Some of them can be used as-is. Some need additional info, like the field tokens.

Field values are under the Submission header.

For your zip_code field example, you can use:

For just field:
[submission:values:zip_code]

For just label:
[submission:values:zip_code:label]

For label and field:
[submission:values:zip_code:withlabel]

You'll see there's lots of other stuff you can use, too.

Hope this answers your questions.