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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d2047e3d92ad071f5374b3f0a85d88be1a0be8f22f38c147611af66e9d233eb' 
  AND token = 'kfuhDlhNedSZ/TYtNZIP2/DBe5Xhkfr/J8PS6bYtqHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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