SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6882ffee48aed71d0d9af63bad69f7574ec9460ae030d4051db2b02812162844' 
  AND token = 'GbC+umAmAAmMVP4gy3UZj/jMDekrZHmIcZ3uIB5NpBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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