Set an oven rack to the upper-middle position and heat the oven to 425°F. Line a rimmed sheet pan with foil and lightly oil it.
Pat the salmon very dry. Brush all over with olive oil, then season evenly with kosher salt, black pepper, and smoked paprika. Arrange skin-side down on the prepared pan.
Roast the salmon for 8–10 minutes (thicker fillets may need up to 12), until the flesh is mostly opaque but still slightly translucent in the very center.
While the salmon roasts, make the glaze: In a small saucepan combine honey, soy sauce, lemon juice, Dijon, garlic, red pepper flakes, and lemon zest. Bring to a gentle simmer over medium heat and cook 3–5 minutes, stirring, until syrupy and reduced by about one-third. Remove from heat and whisk in the butter until glossy.
Spoon or brush about half the glaze over the salmon. Switch the oven to broil (high) and broil 1–2 minutes, watching closely, until the glaze bubbles and the edges pick up a light char.
Brush with the remaining glaze and rest 2 minutes on the pan. Serve with lemon wedges.