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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ce882f72f8543d672b30fc92bc6dd64f71dfb5bb7908c741aef24decedd80cd' 
  AND token = '0a/zxqFKs67X8AvQ2cdR2XAP4hjqx7MP/87WxYuj+ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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