SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e77c61943abbf628bfea66873b3220f7b467a0186e1197381ce704716b52a5a5' 
  AND token = 'sGh/9nKE4JKXuiW0D9//weP6jR8+hBUjiBQqyHZ0m1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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