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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b40f55ef58f935021f39d4557c32ab6f3bb330842ea3d243a32d550a4b1ab80' 
  AND token = 'fY9HRqlIy24Z8jDFrDa/GVsePz7nmzcI4y/E6cxAUN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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