SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '972f5a7b048092509fe9adfff7993e9239f36b8cdb03e153db358fdf7a061fcf' 
  AND token = 'trivThNM1Tn8yN+eMLz9XXi2Q6/pBvaj/fHQwCTKh6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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