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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '432291a485a8a89f46abe34bcc79871d31ef5871038b92f87dcdf172c4cdac73' 
  AND token = 't9dhdubptVodrbkZ3aK0kZV1gm5VvgH9GwGDmyxC8/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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