Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b715354350c2c49874b533c022f1707c8bb640716ddf73df7a382254768c44a5' 
  AND token = 'RVAm7yLwsPWPx1R7akZkIp0aNuoqXyVXheV2MkODOHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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