SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '809030b2abd184f889bca3c951484508eb5806f4bbd1aa0cae5e3e9d6039093b' 
  AND token = 'qkHPxIcG4FD9995CvVuvZws8z2j8BCMRYmXBBe92BJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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