SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd07868340b649123a0e08c8d8b7f1e88a8982d605afeca8d7d79104f44dc4e5e' 
  AND token = 'JI+ChwPnYUCV/fBa4eJnjAAb8gEU++mdqzRfBuy792c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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