SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ba1eb8665080c77ca2589152b59a23aaec421560f91a964361ee8fcfe0dfe7f' 
  AND token = 'GwLVMIgmQ+cXZvp/PGosXI/Pv1sRFE/19wtDgJynxR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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