SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1de82eb852fcb9a2470f19db148ca4ee5f16d8116015fce045e784107ef9d0b2' 
  AND token = 'TZxKJd8hCA1JIipnzc7YRrt6KYQXgQ3q/xMKBChP7A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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