Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0f41c8ecd5b1b67f68651946e2b3ac6762576a9105f94a66606b342ab504f36' 
  AND token = 'NrlywrzKCwCyFVfhnEnwNguDH5A6PlbpbgofxLcBiQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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