Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35dcf562e4654ddfb1a1afb7e57a0caa9b5759cd27c712e9d2e6806937ca40fa' 
  AND token = 'O7VHtnnvM6ZD/O3CUDPqT7bOvma41+iwkhTDtFQvzs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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