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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8294af33cdc0c5580acc9991ea04fb7cec140d40aa64609a4c8711df094a3d9c' 
  AND token = '68dgGBeW7IbtuA1AZkuIre3caqXx6U8eJKfQOoFzCUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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