SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29a7ac65500b03ff9cffb9d25b5441404ce6361a4ca877f13fdcabdf783919ee' 
  AND token = 'jwnoz/xee7ofYvZOq+s+Ww1Ab0cqKr1yCFFf8IoZKLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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