It is sometimes used in English, particularly in informal contexts, to emphasize speed or urgency. For example, you might say "I need that report pronto!" to mean you need it immediately.
However, using "pronto" as a prefix is not grammatically correct in English. You wouldn't say "pronto-reply" or "pronto-action".
If you're looking for a prefix that conveys speed or urgency, consider using words like "fast", "quick", "rapid", or "immediate".