SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9192d3d1ed98396472dae1c4c7bc6659614a8b30456cb0968025843dc40d6fe1' 
  AND token = 'BY9SnE2gAgabqhUH0Fw7o9xywbZGHABWrklnnIJtITU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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