Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7f2cdb2df329cda6e43bff440d1d00812f9d2f3f9f46611342d16a00df2526b' 
  AND token = 'b/AjdYIZbOXoloZ4KVk/N6VBYbSy3RJd2zkxAtcayFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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