SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e6768964fd13e97c9d3d29543e860e39868198fed22a98458f578ba2e21da5d' 
  AND token = 'V8Cnn6NTIO2jOA9NrK5Wk+tBZYvPL8NiHJVRb+Z7Xjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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