SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2904c771f465e549abfdb94d8425821b922a671a5e9d11a89f938cdd32584d8' 
  AND token = 'krUvMce+J/iTHNSn11QYXPFvuezjNOq1Cm5gC9VWPco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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