SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd417ce83d494a27c2c81df2daf491fa56db82065bfdd237e20813b6fa9f18c83' 
  AND token = 'YJbGwhAcG+yViCX3/IuBXnlvVfEfPOaHOMQpTZj6N50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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