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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '562bca1ef46378faa6c827319c0f7059fed48cb04b19b47e71e8b88a8c5e79b4' 
  AND token = 'pzYNzdIbXDRt3s4nUFn694S9QfUnRTCqOxZgsropVks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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