SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b4b1346f8873984865ad9d17475ebe72c4d0433ed8b976697e714a52b4cd891' 
  AND token = 'ipLpG1Cfn0XtsG8jYerzD9TlHhJWWmYBs2qMOFMmu2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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