Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00d3ce3490e2d2a85a4aa1b2e943abaad21f619bf9edc3a078bc318ae5db218c' 
  AND token = 'BWDxrCDRYjq3lcBn6VzYPhBmH9eATwPbCeKTbmDGIyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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