SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f24e17e8979144e47bd08fde5d868d5bea432a7d480d34f9cadfa59944f86ca' 
  AND token = '4AW7n1jJoJDrXZHGWYLbZJOKq04BvGHC+9GjI1dfI8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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