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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c8747373e7198b7eb4d0c6a94dcfcfce9d5c3326da2ee97a2e454889a9c49c3' 
  AND token = 'woBnPJMoRjo4p7wHlvUxo0Z0Ih9Yh5GePwW9V1JaCJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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