SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02f036f51dcf3acf3ca7a5c37e7cd76f39178b90165dbf8d8714fdacc2676599' 
  AND token = 'haKJNHv6VvpyIEVLP7sVFlKSFMnWxboSZtq3zm0T+9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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