SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68df4046970fae6e58cc40dd54248d85157018b7297df88e8fc06326a34b64cb' 
  AND token = 'hH0mnJMBZ51IoNVshVSYXlDKWjm0zhVbWTG06N6piww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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