SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17ec2fb72b2678fb0b80772f7baa100f3155885bc09dd6dd89ede8b979194ac2' 
  AND token = 'YzPS/5N0wP8NqM/pZqJ1TaLoa2GUfQ+6vwGkogcTfng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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