SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d6d3442f75aa7c5bd3affa824772dce611841c4882e0e6c80949d3ecd53f2f9' 
  AND token = 'r2WdK9YzFvGSwtYiBvR0ULbPmphYy2O6o2VPcRtDGeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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