SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9423f1aad3ac959e09a4fbdc2904a9b83ac2577f43126997d3b00af00e871264' 
  AND token = 'hpSqHgZUVYv2hmwrsXidiDhR3ZVjl+4DnpZkAu2eOmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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