SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ee2a4bc7cde6d67510e5683ff8b9bb52e44af164b953b3c7073bee6fd04479a' 
  AND token = 'GfDa4nN0kWZ/ffdxmCGEP+ixPuhbvsWFYB2Dq+P9rGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00164

JSON explain

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