SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3abd6806e011e67c23d0154b1e849c39222f1d24a9065d247c6443a62278b534' 
  AND token = 'IYUZtsJ+MigDQFHgUMNq//2O9Sn3gXXEuIxKWEP7hoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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