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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '516c1f7b8728d4cb1949425936c1e3e4599ae02a8dcf32d29372b87a3aeb779f' 
  AND token = 'AbEVg3AskVh77+BC7ENhVmubYNwtCRFs117l2MbK5+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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