SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79ed9cedde350c618c074e1fa12ff9e58a95b13ce0cc34b720b297f8fbf3292e' 
  AND token = 'm5MV+HndumNSV7BE4jvzHnjIXRvV+3ai8G45n1zgTPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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