Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5714251fb9c0a55bdc4f14b74fbdefd2a3900dbb46b530deecc9289a0f43e1c' 
  AND token = 'yxH54dK0jSEDDmLAcyKNi1XoqwxaoyJYouk3lflTdo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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