SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c41266d19f2ae56528c6bfcdfbd1281c43afe8b32d927aaafc5d24d78ee0609' 
  AND token = 'iu+ibPbOcp5FUlYG+mVxD93pWgz//BGuYzOUyU3IaSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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