Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a370dc5fe1283751adee603471a84ac670bfd90779aa9d509cf40cc6e609e93a' 
  AND token = 'rtaTOmnKc9HzKb1AtWDCvdaxqtrM0ySO3s/s7F5Mlpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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