Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca817d4dd8c55a2b233f4cf6ea2958ca9e037cc4b69ddd3432efd770cb08574b' 
  AND token = 'rfMGgkaB1ATwAHI3bTi5n84lBf20ywAsV1bN/Kgy8sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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