Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc54b44d36a28d8aeaf1f4aae6310c454146f7dc370ac4f9fa0225be9604c5cb' 
  AND token = 'dQkQEwJVLE7+Rocv8JWkOAwncoXSxg6bfLvKOEaiSm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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