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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e3d3ec30876d7bc9a6ccaf9b502cf6ae8bf503b1faa6442901050c9f02c796c' 
  AND token = 'Auo7ZBEmiEjT2SA65uG033ilATiTBqS2wAriTC5Qnrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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