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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e2d58fdae058fa7bf4eb08954092d2658b9ef202c83083eeddabf3a3747aab0' 
  AND token = 'TplYb77ew2tigK8ZRA0pTKVDSU9JwHN9woZC8WZUhSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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