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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '113fa72daad38fc8c08103875770df2d47f7f7655ac058dd7f7da3698e335171' 
  AND token = 'TQojL+IVEebk9tPdmi47E9Mm8DkSfia3lKr/YSBJFhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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