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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb9002762f3c132c46d3b31d76d29eb1b0ec433a3bf89b170930c7ace0993e8a' 
  AND token = '3yRe7D2KwS73Ncqu+kJLOxmXe0T2BdF8JHY6r3zwGEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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