Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c127200cda1609dc1dc2a0a1e4cd1865049efe43fda42d0ca9b2be40bc67bd4' 
  AND token = 'DVRq28d+5yn6hwIEmi6CL/UXIukDIaFSD3zAhwKyqs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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