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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf08a59fda60f5b22dd7a191bafc3239619b3cdced9b0fc08e65c0f475d18f1f' 
  AND token = 'afBt6CNZ2TqPdpFcvGfe9yG5kK/iaSmV+aUdsApPZ28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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