The only allowed attributes for the <aura:token> tag are name and value.
.THIS p { font-family: token(myBodyTextFontFace); font-weight: token(myBodyTextFontWeight); }
If you prefer a more concise function name for referencing tokens, you can use the t() function instead of token(). The two are equivalent. If your token names follow a naming convention or are sufficiently descriptive, the use of the more terse function name won’t affect the clarity of your CSS styles.