SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90a29b8ff0cbb04a9a9246c5f487fbd18704ae16c4d3925788b67c6a445bd616' 
  AND token = '+8BD7LqfJ/k3zpfb/HQtHYGvay56eYwuqNNH1MrDHpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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