Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper for easy cleanup.
Trim the woody ends off the asparagus and place the spears on the prepared baking sheet.
Drizzle the asparagus with half of the olive oil and season with a pinch of the sea salt and black pepper.
Roast the asparagus in the oven for 12 to 15 minutes, or until they are tender and slightly charred at the tips.
While the asparagus roasts, pat the salmon fillet completely dry with a paper towel and season both sides with the remaining salt, pepper, and garlic powder.
Heat the remaining olive oil in a medium non-stick or cast-iron skillet over medium-high heat until the oil is shimmering.
Place the salmon fillet in the pan, skin-side down, and press gently with a spatula for 10 seconds to ensure even contact.
Sear the salmon for 4 to 5 minutes without moving it, until the skin is very crispy and golden.
Carefully flip the fillet and cook for an additional 2 to 3 minutes, depending on the thickness, until the salmon is just cooked through.
Plate the salmon alongside the roasted asparagus and finish with a generous squeeze of fresh lemon juice over everything.