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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d96a31e4c7935a8c5fbb1320de50f7fa645467441e0a5321e9432ebc856fb4f' 
  AND token = '2gfSnDi+SyLXrtNb9UfvOMzbYJzTu9pV4sXv30XSlWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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