SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b85d13c0af428bcb57990bef766c207eed12d83b8f88f3e878eeac46a5458d94' 
  AND token = 'PPrVNuP3HOVkzXkiADwXUYvJhZmqXMks4hxKZFZxTZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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