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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e7a9e47b6ae73d256c87340cca1317e01ecad25752424e2a11f7dd1c641299f' 
  AND token = 'dwi37Yb5Y/PnJNFB4kIEL7ehdNrwMdch9zN0m3xW/p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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