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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9a29d2dd475124f09941eb24f234ead0914a11ee9c2d8983132c38b23e0d879' 
  AND token = 'Rxw+/b/JUxlZf+gAJxRU1aY3QoEF7qWWj6R/mCpfb2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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