SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15857febefaa4a35e477b3476cc7e9f8299ab3bf42b0023913d81724d5497c75' 
  AND token = '/2c8H0K2/ip0u/1nji9ADzTGYQqmy29JSR1jn6LUfqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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