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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ff3b1fdc1e22935bfee39ed81bc35adb2049a04fd6d23895d38bab4d6f48f8f' 
  AND token = 'Izbk9j/xMBdq7EfN+cJu9rpW+YUzSrNaFmK6w0wd8kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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