SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e70c38004844fc6bc1f088237b6007511a2801353d2131d13c4d12bc3ef0ab25' 
  AND token = 'wH4mOtkWhZmqnunr1mIBvJY0zEJLXw8/XmTi4ZWEDfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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