For the salad: Bring a medium pot of salted water to a boil. Using a paring knife, trim the ends of the snap peas. Blanch the peas in the boiling water just until tender-crisp and bright green, 2 to 3 minutes. Remove the peas from the pot and cool completely in ice water, about 1 minute. Drain the peas on a paper towel-lined baking sheet.
Using a chef's knife, trim the roots and stems off the radishes. Quarter about half and thinly slice the rest to create texture in the salad. Mince the chives.
In a large salad bowl, combine the peas, radishes, and minced chives.
For the vinaigrette: In a small glass jar or plastic container with a tight-fitting lid, combine the olive oil, vinegar, honey, salt, and pepper. Shake to combine.