SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7de63a64cac617d9ac09c2f1c81d3b56c596d89d42f45235b97bf530ee844df' 
  AND token = 'LQzvXSJvgLrYvTmAnfwmJ7WvC2r6noQrcM71GN7zx4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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