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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '932413910ea5a6439dd7298c7d3364d9b17225d427f2a3327f9a05dff57c013d' 
  AND token = 'v0+QMnlFz1EwLNeULMnSoIMGcejl9OveylOMJf9aHQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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