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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb964cfc9b642245a45dfe986d6e323aa9ed44a8ed7c377be8fbe70595eb6e22' 
  AND token = 'KSbbiQe7oj+WZSDFwC2lsKutsVa+L67MGuWSRY9LX8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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