SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70cbb97063b25996973e44717d886a1aa3b79d496f2f6924966f2f266b0c9817' 
  AND token = 'BuUPy3ahAQBiJl5F6JK1+tq9GtnfmmidY1KxVYkLhAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}