SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4333e7e2f916627cf64f7b2a22a407f33d0d8ae873a19b4427edc45a0660f338' 
  AND token = 'hgn4ev+H26bXfxh3MyXKKmzsgaVfGYYJFYqJZ1EBfiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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