SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3759f113cb5966758392a42f9e22b006fe0039a4b0dc099e2424389a4cd61e6a' 
  AND token = 'ImFhTUj9rg+jpioYfjC6Rb6nJxAGE5Nj8fRJVNjJzmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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