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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9724084798b594e9cdc8d803e582b856803d3a43e5a1114252117111b234eae5' 
  AND token = '9quUvhxuXI6f6as9u6xwFn4EMHwBlP7Sufn2FF31ZyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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