Or, take the bolus 45 min before the poptart. Poptarts are very very fast -- high glycemic index and not much digestion required.
In regards to your question about Humalog timing with the poptart... I would have to disagree with the suggestion of taking the Humalog bolus 45 minutes before the meal. Everything I have heard/read about Humalog states that no matter what the sugar level is before the meal, you should never take Humalog more than 15 minutes before eating. I can collaborate this, as I have run into trouble before by taking Humalog more than 15 minutes before eating (crashed low). I suppose the absorbtion rate varies from person to person, but for saftey 15 minutes is the maximum lead time for a Humalog bolus.